Here Are Three Things You Could Do If You Do

Here are three things you could do if you do not attend your economics class: watch television with some friends (you value this at $25) ,read a good novel (you value this at $13) ,or go in to work (you could earn $20 during the economics class) .The opportunity cost of going to your economics class is

A) $20,because this is the only alternative of the three where you actually receive a monetary payment.
B) $13,because this is the lowest valued alternative forfeited.
C) $25,because this is the highest valued alternative forfeited.
D) $58,because this is the total dollar sum of the alternatives forfeited.